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39 * Low-level wrappers for OS-specific file handling with some \Gromacs
43 * \ingroup module_utility
45 #ifndef GMX_UTILITY_FUTIL_H
46 #define GMX_UTILITY_FUTIL_H
51 #include "gromacs/utility/basedefinitions.h"
60 #include "gromacs/utility/gmx_header_config.h"
61 /*! \def DIR_SEPARATOR
63 * Directory separator on this OS.
65 * Native Windows uses backslash path separators (but accepts also slashes).
66 * Cygwin and most other systems use slash.
69 * Get rid of this (Redmine #950), or at least remove this from an installed
70 * header. It is not necessary for constructing paths on the systems that it
71 * currently supports, and is not reliable in parsing input paths either, since
72 * Windows needs to accept both instead of only DIR_SEPARATOR.
74 #ifdef GMX_NATIVE_WINDOWS
75 #define DIR_SEPARATOR '\\'
77 #define DIR_SEPARATOR '/'
82 * Maximum path length, if the OS provides one, otherwise a fixed constant.
85 # define GMX_PATH_MAX PATH_MAX
86 #elif defined MAX_PATH
87 # define GMX_PATH_MAX MAX_PATH
89 # define GMX_PATH_MAX 4096
92 /** \Gromacs definition to use instead of `off_t`. */
93 typedef gmx_int64_t gmx_off_t;
96 * Turn off buffering for output files (which is default) for debugging
99 * This only has effect on files opened with gmx_ffopen().
101 void gmx_disable_file_buffering(void);
104 * Enables backups with the specified number of maximum backups.
106 * If \p count == 0, disables backups. If not called, this is the default.
107 * If \p count == -1, reads the count from an environment variable.
109 * This is not currently thread-safe, as it is only called during
110 * initialization code.
112 void gmx_set_max_backup_count(int count);
115 * Check whether a path exists.
117 * \returns `TRUE` when \p fname exists.
119 * Note that this returns `TRUE` even if \p fname is a directory instead of a
122 gmx_bool gmx_fexist(const char *fname);
125 * Makes a backup of file if the file exists.
127 void make_backup(const char *file);
130 * Opens a file, with \Gromacs-specific additions.
132 * If the file is in compressed format, opens a pipe which uncompresses the
133 * file on the fly. For this to work, gmx_ffclose() and frewind() should
134 * always be used for files opened with gmx_ffopen() instead of fclose() and
135 * rewind(). For compressed files, the \p file parameter should be passed
136 * without the compressed extension; if that file is not found, then a few
137 * compression extensions are tried.
138 * Creates a backup if a file opened for writing already exists before
140 * A fatal error results if the file cannot be opened, for whatever reason.
142 FILE *gmx_ffopen(const char *file, const char *mode);
144 /** Closes a file opened with gmx_ffopen(). */
145 int gmx_ffclose(FILE *fp);
148 * Wraps rewind() for files opened with gmx_ffopen().
150 * A fatal error results if this function is called for a pipe (a compressed
153 void frewind(FILE *fp);
155 /** OS-independent 64-bit fseek(). */
156 int gmx_fseek(FILE *stream, gmx_off_t offset, int whence);
158 /** OS-independent 64-bit ftell(). */
159 gmx_off_t gmx_ftell(FILE *stream);
161 /** OS-independent truncate(). */
162 int gmx_truncate(const char *filename, gmx_off_t length);
165 * Finds full path for a library file.
167 * Searches first in the current directory, and then in the configured library
169 * Fatal error results if the file is not found in any location.
170 * The caller is responsible of freeing the returned string.
172 char *gmxlibfn(const char *file);
175 * Opens a library file for reading.
177 * Works as gmxlibfn(), except that it opens the file and returns a file
180 FILE *libopen(const char *file);
183 * More flexible gmxlibfn().
185 * Works as gmxlibfn(), but provides control whether the current working
186 * directory is searched or not, and whether a missing file is a fatal error or
189 char *low_gmxlibfn(const char *file, gmx_bool bAddCWD, gmx_bool bFatal);
192 * Alternative for libopen() that optionally does not exit.
194 * Works as libopen(), but provides control whether a missing file is a fatal
197 FILE *low_libopen(const char *file, gmx_bool bFatal);
201 * Creates unique name for temp file (wrapper around mkstemp).
203 * \p buf should be at least 7 bytes long
205 void gmx_tmpnam(char *buf);
208 * OS-independent rename().
210 * Renames/moves a file atomically, if the OS makes that available.
212 int gmx_file_rename(const char *oldname, const char *newname);
215 * Copies a file (data only) oldname to newname.
217 * If \p copy_if_empty is `FALSE`, the file won't be copied if it's empty.
219 int gmx_file_copy(const char *oldname, const char *newname, gmx_bool copy_if_empty);
222 * OS-independent fsync().
224 * Only use this during checkpointing!
226 int gmx_fsync(FILE *fp);
229 * OS-independent chdir().
231 * Exits with a fatal error if changing the directory fails.
233 void gmx_chdir(const char *directory);
235 * OS-independent getcwd().
237 * Exits with a fatal error if the call fails.
239 void gmx_getcwd(char *buffer, size_t size);
247 class DataFileFinder;
250 * Gets a finder for locating data files from share/top/.
252 * \returns Finder set with setLibraryFileFinder(), or a default finder.
254 * If setLibraryFileFinder() has not been called (or a `NULL` finder has been
255 * set), a default finder is returned.
256 * The default finder searches data files from the directory identified by the
257 * global program context; it does not respect GMXLIB environment variable.
258 * Calling initForCommandLine() sets a finder that respects GMXLIB.
262 * See setLibraryFileFinder() for thread safety.
264 * \ingroup module_utility
266 const DataFileFinder &getLibraryFileFinder();
268 * Sets a finder for location data files from share/top/.
270 * \param[in] finder finder to set
271 * (can be NULL to restore the default finder).
273 * The library does not take ownership of \p finder.
274 * The provided object must remain valid until the global instance is changed
275 * by another call to setLibraryFileFinder().
277 * The global instance is used by gmxlibfn() and libopen().
279 * This method is not thread-safe. See setProgramContext(); the same
280 * constraints apply here as well.
284 void setLibraryFileFinder(const DataFileFinder *finder);